Class Cryptography

java.lang.Object

com.easypost.utils.Cryptography

public abstract class Cryptography
extends Object

Class for various cryptography utilities.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Cryptography.HmacAlgorithm	Enums for the supported HMAC algorithms.

Constructor Summary

Constructors

Constructor	Description
Cryptography()

Method Summary

Modifier and Type	Method	Description
static byte[]	createHMAC(byte @NotNull [] data, @NotNull String key, @NotNull Cryptography.HmacAlgorithm algorithm)	Calculate the HMAC hex digest of a string.
static String	hexEncodeToString(byte @NotNull [] bytes)	Hex-encode a byte array to a string.
static boolean	signaturesMatch(byte @NotNull [] signature1, byte @NotNull [] signature2)	Check whether two signatures match.
static boolean	signaturesMatch(@NotNull String signature1, @NotNull String signature2)	Check whether two signatures match.
static String	toHMACSHA256HexDigest(byte @NotNull [] data, @NotNull String key, @Nullable Normalizer.Form normalizationForm)	Calculate the HMAC-SHA256 hex digest of a string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Cryptography

public Cryptography()

Method Details

hexEncodeToString

public static String hexEncodeToString(byte @NotNull [] bytes)

Hex-encode a byte array to a string.

Parameters:

bytes - the byte array to hex-encode.

Returns:

the hex-encoded byte array string.

toHMACSHA256HexDigest

public static String toHMACSHA256HexDigest(byte @NotNull [] data,
 @NotNull
 @NotNull String key,
 @Nullable Normalizer.Form normalizationForm)

Calculate the HMAC-SHA256 hex digest of a string.

Parameters:

data - Data to calculate hex digest for.

key - Key to use in HMAC calculation.

normalizationForm - Normalizer.Form to use when normalizing key. No normalization when null.

Returns:

Hex digest of data.

createHMAC

public static byte[] createHMAC(byte @NotNull [] data,
 @NotNull
 @NotNull String key,
 @NotNull
 @NotNull Cryptography.HmacAlgorithm algorithm)

Calculate the HMAC hex digest of a string.

Parameters:

data - Data to calculate hex digest for.

key - Key to use in HMAC calculation.

algorithm - Cryptography.HmacAlgorithm to use to calculate HMAC.

Returns:

Hex digest of data.

signaturesMatch

public static boolean signaturesMatch(byte @NotNull [] signature1,
 byte @NotNull [] signature2)

Check whether two signatures match. This is safe against timing attacks.

Parameters:

signature1 - First signature to check.

signature2 - Second signature to check.

Returns:

True if signatures match, false otherwise.

signaturesMatch

public static boolean signaturesMatch(@NotNull
 @NotNull String signature1,
 @NotNull
 @NotNull String signature2)

Check whether two signatures match. This is safe against timing attacks.

Parameters:

signature1 - First signature to check.

signature2 - Second signature to check.

Returns:

True if signatures match, false otherwise.